CVE-2026-64780 in iOS
Summary
by MITRE • 08/17/2026
The issue was addressed with improved checks. This issue is fixed in iOS 18.7.10 and iPadOS 18.7.10, iOS 26.6.1 and iPadOS 26.6.1, macOS Tahoe 26.6.2. Processing maliciously crafted web content may lead to an unexpected Safari crash.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 08/18/2026
The vulnerability described involves a flaw in the processing of web content within Apple's Safari browser engine, which can be exploited by attackers delivering maliciously crafted HTML or JavaScript payloads. This issue is characterized as a logic error or insufficient validation mechanism that fails to properly handle specific edge cases during the parsing and rendering phases of web page construction. When a user navigates to a webpage containing this specially constructed content, the browser's internal state machine encounters an invalid condition it cannot recover from gracefully. Instead of isolating the fault within a sandboxed process or throwing a controlled exception that allows for safe termination, the application triggers an unrecoverable error path leading directly to a crash. This behavior indicates a breakdown in defensive programming practices where input validation and boundary checks are either absent or incorrectly implemented during critical rendering operations.
From a technical perspective, this type of flaw typically aligns with CWE-20 Improper Input Validation or potentially CWE-787 Out-of-bounds Write if the malformed content causes memory corruption leading to instability. The attack vector is primarily remote via the web, requiring no user interaction beyond visiting the malicious site, which classifies it under ATT&CK technique T1189 Drive-by Compromise. Although the immediate impact described is a denial of service through application crash rather than arbitrary code execution or privilege escalation, such crashes can sometimes be leveraged to trigger further vulnerabilities if they result in memory corruption states that are exploitable for heap spraying or control flow hijacking attempts. The unpredictability of the crash location and state makes exploitation more difficult but does not eliminate the risk entirely, especially when combined with other browser-side flaws.
The operational impact centers on service availability and user trust. A successful exploit results in the abrupt termination of the Safari process, causing data loss for any unsaved work within tabs or windows that were open at the time. For enterprise environments relying on web-based applications accessed through mobile devices or macOS systems, this can disrupt productivity and create a negative perception of system stability. Furthermore, repeated crashes may indicate deeper architectural weaknesses in the browser engine's handling of complex DOM structures or script execution contexts. While the current description emphasizes the crash aspect, security analysts must consider that denial-of-service vulnerabilities often serve as precursors to more severe exploits if underlying memory management issues are present but not yet fully understood by developers.
Apple has addressed this vulnerability through improved checks within the browser engine's codebase, ensuring that malformed inputs are detected and handled safely before they can trigger unstable states. The fix is included in iOS 18.7.10, iPadOS 18.7.10, macOS Tahoe 26.6.2, as well as earlier supported versions like iOS 26.6.1 and iPadOS 26.6.1. Users are strongly advised to update their devices immediately to mitigate the risk of exploitation via malicious web content. In addition to applying these patches, organizations should enforce strict Content Security Policies (CSP) where possible to restrict inline scripts and external resource loading, thereby reducing the attack surface available to attackers attempting to deliver such crafted payloads. Regular monitoring for unusual browser behavior or frequent crashes can also help in identifying potential exploitation attempts before they cause significant disruption.